Last week I spoke at the Bangalore Software Architects Meetup on the topic "Do you need microservices architecture?". Here is the presentation and bit more info about it.
I feel that one must answer the below questions before they choose a microservices architecture and it will be beneficial to you if the answer to these questions are "YES".
1. Does your services represents different business cases/domains..?
2. Does the services needs to be deployed and managed independently..?
3. Does different parts of the application has different scaling/Technology needs..?
A modular monolith can be transformed to a set of microservices in case the need arises. So, we should start with monolith when we are not sure about the future.